ABB REL670 - Page 96

88
Distance protection Chapter 11
Verifying settings by secondary
injection
Figure 28: Operate characteristic for phase selection element, forward direction single phase
faults.
ArgDir
R (Ohm/phase)
X (Ohm/phase)
RFFwPE
60 deg
1
2
3
4
)1(
3
2
XNX +⋅
Earthfault loop
5
6
8
9
10
Default values:
ArgNegRes=115
ArgDir=15
ArgLd=30
ArgNegDir
85%
ArgLd
20%
20% of RLdFw
80% of RLdFw
7
11
12
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